/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2007 INRIA, France Telecom
 * All rights reserved.
 */
package org.rsbot.loader.asm;

/**
 * A {@link MethodVisitor} that generates methods in bytecode form. Each visit
 * method of this class appends the bytecode corresponding to the visited
 * instruction to a byte vector, in the order these methods are called.
 * 
 * @author Eric Bruneton
 * @author Eugene Kuleshov
 */
class MethodWriter implements MethodVisitor {

	/**
	 * Pseudo access flag used to denote constructors.
	 */
	static final int ACC_CONSTRUCTOR = 262144;

	/**
	 * Frame has exactly the same locals as the previous stack map frame and
	 * number of stack items is zero.
	 */
	static final int SAME_FRAME = 0; // to 63 (0-3f)

	/**
	 * Frame has exactly the same locals as the previous stack map frame and
	 * number of stack items is 1
	 */
	static final int SAME_LOCALS_1_STACK_ITEM_FRAME = 64; // to 127 (40-7f)

	/**
	 * Reserved for future use
	 */
	static final int RESERVED = 128;

	/**
	 * Frame has exactly the same locals as the previous stack map frame and
	 * number of stack items is 1. Offset is bigger then 63;
	 */
	static final int SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED = 247; // f7

	/**
	 * Frame where current locals are the same as the locals in the previous
	 * frame, except that the k last locals are absent. The value of k is given
	 * by the formula 251-frame_type.
	 */
	static final int CHOP_FRAME = 248; // to 250 (f8-fA)

	/**
	 * Frame has exactly the same locals as the previous stack map frame and
	 * number of stack items is zero. Offset is bigger then 63;
	 */
	static final int SAME_FRAME_EXTENDED = 251; // fb

	/**
	 * Frame where current locals are the same as the locals in the previous
	 * frame, except that k additional locals are defined. The value of k is
	 * given by the formula frame_type-251.
	 */
	static final int APPEND_FRAME = 252; // to 254 // fc-fe

	/**
	 * Full frame
	 */
	static final int FULL_FRAME = 255; // ff

	/**
	 * Indicates that the stack map frames must be recomputed from scratch. In
	 * this case the maximum stack size and number of local variables is also
	 * recomputed from scratch.
	 * 
	 * @see #compute
	 */
	private static final int FRAMES = 0;

	/**
	 * Indicates that the maximum stack size and number of local variables must
	 * be automatically computed.
	 * 
	 * @see #compute
	 */
	private static final int MAXS = 1;

	/**
	 * Indicates that nothing must be automatically computed.
	 * 
	 * @see #compute
	 */
	private static final int NOTHING = 2;

	/**
	 * Computes the future value of a bytecode offset.
	 * <p>
	 * Note: it is possible to have several entries for the same instruction in
	 * the <tt>indexes</tt> and <tt>sizes</tt>: two entries (index=a,size=b) and
	 * (index=a,size=b') are equivalent to a single entry (index=a,size=b+b').
	 * 
	 * @param indexes
	 *            current positions of the instructions to be resized. Each
	 *            instruction must be designated by the index of its <i>last</i>
	 *            byte, plus one (or, in other words, by the index of the
	 *            <i>first</i> byte of the <i>next</i> instruction).
	 * @param sizes
	 *            the number of bytes to be <i>added</i> to the above
	 *            instructions. More precisely, for each i < <tt>len</tt>,
	 *            <tt>sizes</tt>[i] bytes will be added at the end of the
	 *            instruction designated by <tt>indexes</tt>[i] or, if
	 *            <tt>sizes</tt>[i] is negative, the <i>last</i> |
	 *            <tt>sizes[i]</tt>| bytes of the instruction will be removed
	 *            (the instruction size <i>must not</i> become negative or
	 *            null).
	 * @param begin
	 *            index of the first byte of the source instruction.
	 * @param end
	 *            index of the first byte of the target instruction.
	 * @return the future value of the given bytecode offset.
	 */
	static int getNewOffset(final int[] indexes, final int[] sizes,
			final int begin, final int end) {
		int offset = end - begin;
		for (int i = 0; i < indexes.length; ++i) {
			if (begin < indexes[i] && indexes[i] <= end) {
				// forward jump
				offset += sizes[i];
			} else if (end < indexes[i] && indexes[i] <= begin) {
				// backward jump
				offset -= sizes[i];
			}
		}
		return offset;
	}

	/**
	 * Updates the offset of the given label.
	 * 
	 * @param indexes
	 *            current positions of the instructions to be resized. Each
	 *            instruction must be designated by the index of its <i>last</i>
	 *            byte, plus one (or, in other words, by the index of the
	 *            <i>first</i> byte of the <i>next</i> instruction).
	 * @param sizes
	 *            the number of bytes to be <i>added</i> to the above
	 *            instructions. More precisely, for each i < <tt>len</tt>,
	 *            <tt>sizes</tt>[i] bytes will be added at the end of the
	 *            instruction designated by <tt>indexes</tt>[i] or, if
	 *            <tt>sizes</tt>[i] is negative, the <i>last</i> |
	 *            <tt>sizes[i]</tt>| bytes of the instruction will be removed
	 *            (the instruction size <i>must not</i> become negative or
	 *            null).
	 * @param label
	 *            the label whose offset must be updated.
	 */
	static void getNewOffset(final int[] indexes, final int[] sizes,
			final Label label) {
		if ((label.status & Label.RESIZED) == 0) {
			label.position = getNewOffset(indexes, sizes, 0, label.position);
			label.status |= Label.RESIZED;
		}
	}

	/**
	 * Reads a signed int value in the given byte array.
	 * 
	 * @param b
	 *            a byte array.
	 * @param index
	 *            the start index of the value to be read.
	 * @return the read value.
	 */
	static int readInt(final byte[] b, final int index) {
		return (b[index] & 0xFF) << 24 | (b[index + 1] & 0xFF) << 16
		| (b[index + 2] & 0xFF) << 8 | b[index + 3] & 0xFF;
	}

	/**
	 * Reads a signed short value in the given byte array.
	 * 
	 * @param b
	 *            a byte array.
	 * @param index
	 *            the start index of the value to be read.
	 * @return the read value.
	 */
	static short readShort(final byte[] b, final int index) {
		return (short) ((b[index] & 0xFF) << 8 | b[index + 1] & 0xFF);
	}

	/**
	 * Reads an unsigned short value in the given byte array.
	 * 
	 * @param b
	 *            a byte array.
	 * @param index
	 *            the start index of the value to be read.
	 * @return the read value.
	 */
	static int readUnsignedShort(final byte[] b, final int index) {
		return (b[index] & 0xFF) << 8 | b[index + 1] & 0xFF;
	}

	/**
	 * Writes a short value in the given byte array.
	 * 
	 * @param b
	 *            a byte array.
	 * @param index
	 *            where the first byte of the short value must be written.
	 * @param s
	 *            the value to be written in the given byte array.
	 */
	static void writeShort(final byte[] b, final int index, final int s) {
		b[index] = (byte) (s >>> 8);
		b[index + 1] = (byte) s;
	}

	/**
	 * Next method writer (see {@link ClassWriter#firstMethod firstMethod}).
	 */
	MethodWriter next;

	/**
	 * The class writer to which this method must be added.
	 */
	final ClassWriter cw;

	/**
	 * Access flags of this method.
	 */
	private int access;

	/**
	 * The index of the constant pool item that contains the name of this
	 * method.
	 */
	private final int name;

	/**
	 * The index of the constant pool item that contains the descriptor of this
	 * method.
	 */
	private final int desc;

	/**
	 * The descriptor of this method.
	 */
	private final String descriptor;

	/**
	 * The signature of this method.
	 */
	String signature;

	/**
	 * If not zero, indicates that the code of this method must be copied from
	 * the ClassReader associated to this writer in <code>cw.cr</code>. More
	 * precisely, this field gives the index of the first byte to copied from
	 * <code>cw.cr.b</code>.
	 */
	int classReaderOffset;

	/**
	 * If not zero, indicates that the code of this method must be copied from
	 * the ClassReader associated to this writer in <code>cw.cr</code>. More
	 * precisely, this field gives the number of bytes to copied from
	 * <code>cw.cr.b</code>.
	 */
	int classReaderLength;

	/**
	 * Number of exceptions that can be thrown by this method.
	 */
	int exceptionCount;

	/**
	 * The exceptions that can be thrown by this method. More precisely, this
	 * array contains the indexes of the constant pool items that contain the
	 * internal names of these exception classes.
	 */
	int[] exceptions;

	/**
	 * The annotation default attribute of this method. May be <tt>null</tt>.
	 */
	private ByteVector annd;

	/**
	 * The runtime visible annotations of this method. May be <tt>null</tt>.
	 */
	private AnnotationWriter anns;

	/**
	 * The runtime invisible annotations of this method. May be <tt>null</tt>.
	 */
	private AnnotationWriter ianns;

	/**
	 * The runtime visible parameter annotations of this method. May be
	 * <tt>null</tt>.
	 */
	private AnnotationWriter[] panns;

	/**
	 * The runtime invisible parameter annotations of this method. May be
	 * <tt>null</tt>.
	 */
	private AnnotationWriter[] ipanns;

	/**
	 * The number of synthetic parameters of this method.
	 */
	private int synthetics;

	/**
	 * The non standard attributes of the method.
	 */
	private Attribute attrs;

	/**
	 * The bytecode of this method.
	 */
	private ByteVector code = new ByteVector();

	/**
	 * Maximum stack size of this method.
	 */
	private int maxStack;

	/**
	 * Maximum number of local variables for this method.
	 */
	private int maxLocals;

	/**
	 * Number of stack map frames in the StackMapTable attribute.
	 */
	private int frameCount;

	/**
	 * The StackMapTable attribute.
	 */
	private ByteVector stackMap;

	/**
	 * The offset of the last frame that was written in the StackMapTable
	 * attribute.
	 */
	private int previousFrameOffset;

	/**
	 * The last frame that was written in the StackMapTable attribute.
	 * 
	 * @see #frame
	 */
	private int[] previousFrame;

	/**
	 * Index of the next element to be added in {@link #frame}.
	 */
	private int frameIndex;

	/**
	 * The current stack map frame. The first element contains the offset of the
	 * instruction to which the frame corresponds, the second element is the
	 * number of locals and the third one is the number of stack elements. The
	 * local variables start at index 3 and are followed by the operand stack
	 * values. In summary frame[0] = offset, frame[1] = nLocal, frame[2] =
	 * nStack, frame[3] = nLocal. All types are encoded as integers, with the
	 * same format as the one used in {@link Label}, but limited to BASE types.
	 */
	private int[] frame;

	/**
	 * Number of elements in the exception handler list.
	 */
	private int handlerCount;

	/**
	 * The first element in the exception handler list.
	 */
	private Handler firstHandler;

	/**
	 * The last element in the exception handler list.
	 */
	private Handler lastHandler;

	/**
	 * Number of entries in the LocalVariableTable attribute.
	 */
	private int localVarCount;

	/**
	 * The LocalVariableTable attribute.
	 */
	private ByteVector localVar;

	/**
	 * Number of entries in the LocalVariableTypeTable attribute.
	 */
	private int localVarTypeCount;

	// ------------------------------------------------------------------------

	/*
	 * Fields for the control flow graph analysis algorithm (used to compute the
	 * maximum stack size). A control flow graph contains one node per "basic
	 * block", and one edge per "jump" from one basic block to another. Each
	 * node (i.e., each basic block) is represented by the Label object that
	 * corresponds to the first instruction of this basic block. Each node also
	 * stores the list of its successors in the graph, as a linked list of Edge
	 * objects.
	 */

	/**
	 * The LocalVariableTypeTable attribute.
	 */
	private ByteVector localVarType;

	/**
	 * Number of entries in the LineNumberTable attribute.
	 */
	private int lineNumberCount;

	/**
	 * The LineNumberTable attribute.
	 */
	private ByteVector lineNumber;

	/**
	 * The non standard attributes of the method's code.
	 */
	private Attribute cattrs;

	/**
	 * Indicates if some jump instructions are too small and need to be resized.
	 */
	private boolean resize;

	/**
	 * The number of subroutines in this method.
	 */
	private int subroutines;

	// ------------------------------------------------------------------------
	// Constructor
	// ------------------------------------------------------------------------

	/**
	 * Indicates what must be automatically computed.
	 * 
	 * @see #FRAMES
	 * @see #MAXS
	 * @see #NOTHING
	 */
	private final int compute;

	// ------------------------------------------------------------------------
	// Implementation of the MethodVisitor interface
	// ------------------------------------------------------------------------

	/**
	 * A list of labels. This list is the list of basic blocks in the method,
	 * i.e. a list of Label objects linked to each other by their
	 * {@link Label#successor} field, in the order they are visited by
	 * {@link MethodVisitor#visitLabel}, and starting with the first basic
	 * block.
	 */
	private Label labels;

	/**
	 * The previous basic block.
	 */
	private Label previousBlock;

	/**
	 * The current basic block.
	 */
	private Label currentBlock;

	/**
	 * The (relative) stack size after the last visited instruction. This size
	 * is relative to the beginning of the current basic block, i.e., the true
	 * stack size after the last visited instruction is equal to the
	 * {@link Label#inputStackTop beginStackSize} of the current basic block
	 * plus <tt>stackSize</tt>.
	 */
	private int stackSize;

	/**
	 * The (relative) maximum stack size after the last visited instruction.
	 * This size is relative to the beginning of the current basic block, i.e.,
	 * the true maximum stack size after the last visited instruction is equal
	 * to the {@link Label#inputStackTop beginStackSize} of the current basic
	 * block plus <tt>stackSize</tt>.
	 */
	private int maxStackSize;

	/**
	 * Constructs a new {@link MethodWriter}.
	 * 
	 * @param cw
	 *            the class writer in which the method must be added.
	 * @param access
	 *            the method's access flags (see {@link Opcodes}).
	 * @param name
	 *            the method's name.
	 * @param desc
	 *            the method's descriptor (see {@link Type}).
	 * @param signature
	 *            the method's signature. May be <tt>null</tt>.
	 * @param exceptions
	 *            the internal names of the method's exceptions. May be
	 *            <tt>null</tt>.
	 * @param computeMaxs
	 *            <tt>true</tt> if the maximum stack size and number of local
	 *            variables must be automatically computed.
	 * @param computeFrames
	 *            <tt>true</tt> if the stack map tables must be recomputed from
	 *            scratch.
	 */
	MethodWriter(final ClassWriter cw, final int access, final String name,
			final String desc, final String signature,
			final String[] exceptions, final boolean computeMaxs,
			final boolean computeFrames) {
		if (cw.firstMethod == null) {
			cw.firstMethod = this;
		} else {
			cw.lastMethod.next = this;
		}
		cw.lastMethod = this;
		this.cw = cw;
		this.access = access;
		this.name = cw.newUTF8(name);
		this.desc = cw.newUTF8(desc);
		descriptor = desc;
		if (ClassReader.SIGNATURES) {
			this.signature = signature;
		}
		if (exceptions != null && exceptions.length > 0) {
			exceptionCount = exceptions.length;
			this.exceptions = new int[exceptionCount];
			for (int i = 0; i < exceptionCount; ++i) {
				this.exceptions[i] = cw.newClass(exceptions[i]);
			}
		}
		compute = computeFrames ? FRAMES : computeMaxs ? MAXS : NOTHING;
		if (computeMaxs || computeFrames) {
			if (computeFrames && "<init>".equals(name)) {
				this.access |= ACC_CONSTRUCTOR;
			}
			// updates maxLocals
			int size = Type.getArgumentsAndReturnSizes(descriptor) >> 2;
			if ((access & Opcodes.ACC_STATIC) != 0) {
				--size;
			}
			maxLocals = size;
			// creates and visits the label for the first basic block
			labels = new Label();
			labels.status |= Label.PUSHED;
			visitLabel(labels);
		}
	}

	/**
	 * Adds a successor to the {@link #currentBlock currentBlock} block.
	 * 
	 * @param info
	 *            information about the control flow edge to be added.
	 * @param successor
	 *            the successor block to be added to the current block.
	 */
	private void addSuccessor(final int info, final Label successor) {
		// creates and initializes an Edge object...
		final Edge b = new Edge();
		b.info = info;
		b.successor = successor;
		// ...and adds it to the successor list of the currentBlock block
		b.next = currentBlock.successors;
		currentBlock.successors = b;
	}

	/**
	 * Checks if the visit of the current frame {@link #frame} is finished, and
	 * if yes, write it in the StackMapTable attribute.
	 */
	private void endFrame() {
		if (previousFrame != null) { // do not write the first frame
			if (stackMap == null) {
				stackMap = new ByteVector();
			}
			writeFrame();
			++frameCount;
		}
		previousFrame = frame;
		frame = null;
	}

	/**
	 * Returns the size of the bytecode of this method.
	 * 
	 * @return the size of the bytecode of this method.
	 */
	final int getSize() {
		if (classReaderOffset != 0) {
			return 6 + classReaderLength;
		}
		if (resize) {
			// replaces the temporary jump opcodes introduced by Label.resolve.
			if (ClassReader.RESIZE) {
				resizeInstructions();
			} else {
				throw new RuntimeException("Method code too large!");
			}
		}
		int size = 8;
		if (code.length > 0) {
			cw.newUTF8("Code");
			size += 18 + code.length + 8 * handlerCount;
			if (localVar != null) {
				cw.newUTF8("LocalVariableTable");
				size += 8 + localVar.length;
			}
			if (localVarType != null) {
				cw.newUTF8("LocalVariableTypeTable");
				size += 8 + localVarType.length;
			}
			if (lineNumber != null) {
				cw.newUTF8("LineNumberTable");
				size += 8 + lineNumber.length;
			}
			if (stackMap != null) {
				final boolean zip = (cw.version & 0xFFFF) >= Opcodes.V1_6;
				cw.newUTF8(zip ? "StackMapTable" : "StackMap");
				size += 8 + stackMap.length;
			}
			if (cattrs != null) {
				size += cattrs.getSize(cw, code.data, code.length, maxStack,
						maxLocals);
			}
		}
		if (exceptionCount > 0) {
			cw.newUTF8("Exceptions");
			size += 8 + 2 * exceptionCount;
		}
		if ((access & Opcodes.ACC_SYNTHETIC) != 0
				&& ((cw.version & 0xFFFF) < Opcodes.V1_5 || (access & ClassWriter.ACC_SYNTHETIC_ATTRIBUTE) != 0)) {
			cw.newUTF8("Synthetic");
			size += 6;
		}
		if ((access & Opcodes.ACC_DEPRECATED) != 0) {
			cw.newUTF8("Deprecated");
			size += 6;
		}
		if (ClassReader.SIGNATURES && signature != null) {
			cw.newUTF8("Signature");
			cw.newUTF8(signature);
			size += 8;
		}
		if (ClassReader.ANNOTATIONS && annd != null) {
			cw.newUTF8("AnnotationDefault");
			size += 6 + annd.length;
		}
		if (ClassReader.ANNOTATIONS && anns != null) {
			cw.newUTF8("RuntimeVisibleAnnotations");
			size += 8 + anns.getSize();
		}
		if (ClassReader.ANNOTATIONS && ianns != null) {
			cw.newUTF8("RuntimeInvisibleAnnotations");
			size += 8 + ianns.getSize();
		}
		if (ClassReader.ANNOTATIONS && panns != null) {
			cw.newUTF8("RuntimeVisibleParameterAnnotations");
			size += 7 + 2 * (panns.length - synthetics);
			for (int i = panns.length - 1; i >= synthetics; --i) {
				size += panns[i] == null ? 0 : panns[i].getSize();
			}
		}
		if (ClassReader.ANNOTATIONS && ipanns != null) {
			cw.newUTF8("RuntimeInvisibleParameterAnnotations");
			size += 7 + 2 * (ipanns.length - synthetics);
			for (int i = ipanns.length - 1; i >= synthetics; --i) {
				size += ipanns[i] == null ? 0 : ipanns[i].getSize();
			}
		}
		if (attrs != null) {
			size += attrs.getSize(cw, null, 0, -1, -1);
		}
		return size;
	}

	/**
	 * Ends the current basic block. This method must be used in the case where
	 * the current basic block does not have any successor.
	 */
	private void noSuccessor() {
		if (compute == FRAMES) {
			final Label l = new Label();
			l.frame = new Frame();
			l.frame.owner = l;
			l.resolve(this, code.length, code.data);
			previousBlock.successor = l;
			previousBlock = l;
		} else {
			currentBlock.outputStackMax = maxStackSize;
		}
		currentBlock = null;
	}

	/**
	 * Puts the bytecode of this method in the given byte vector.
	 * 
	 * @param out
	 *            the byte vector into which the bytecode of this method must be
	 *            copied.
	 */
	final void put(final ByteVector out) {
		final int mask = Opcodes.ACC_DEPRECATED
		| ClassWriter.ACC_SYNTHETIC_ATTRIBUTE
		| (access & ClassWriter.ACC_SYNTHETIC_ATTRIBUTE)
		/ (ClassWriter.ACC_SYNTHETIC_ATTRIBUTE / Opcodes.ACC_SYNTHETIC);
		out.putShort(access & ~mask).putShort(name).putShort(desc);
		if (classReaderOffset != 0) {
			out.putByteArray(cw.cr.b, classReaderOffset, classReaderLength);
			return;
		}
		int attributeCount = 0;
		if (code.length > 0) {
			++attributeCount;
		}
		if (exceptionCount > 0) {
			++attributeCount;
		}
		if ((access & Opcodes.ACC_SYNTHETIC) != 0
				&& ((cw.version & 0xFFFF) < Opcodes.V1_5 || (access & ClassWriter.ACC_SYNTHETIC_ATTRIBUTE) != 0)) {
			++attributeCount;
		}
		if ((access & Opcodes.ACC_DEPRECATED) != 0) {
			++attributeCount;
		}
		if (ClassReader.SIGNATURES && signature != null) {
			++attributeCount;
		}
		if (ClassReader.ANNOTATIONS && annd != null) {
			++attributeCount;
		}
		if (ClassReader.ANNOTATIONS && anns != null) {
			++attributeCount;
		}
		if (ClassReader.ANNOTATIONS && ianns != null) {
			++attributeCount;
		}
		if (ClassReader.ANNOTATIONS && panns != null) {
			++attributeCount;
		}
		if (ClassReader.ANNOTATIONS && ipanns != null) {
			++attributeCount;
		}
		if (attrs != null) {
			attributeCount += attrs.getCount();
		}
		out.putShort(attributeCount);
		if (code.length > 0) {
			int size = 12 + code.length + 8 * handlerCount;
			if (localVar != null) {
				size += 8 + localVar.length;
			}
			if (localVarType != null) {
				size += 8 + localVarType.length;
			}
			if (lineNumber != null) {
				size += 8 + lineNumber.length;
			}
			if (stackMap != null) {
				size += 8 + stackMap.length;
			}
			if (cattrs != null) {
				size += cattrs.getSize(cw, code.data, code.length, maxStack,
						maxLocals);
			}
			out.putShort(cw.newUTF8("Code")).putInt(size);
			out.putShort(maxStack).putShort(maxLocals);
			out.putInt(code.length).putByteArray(code.data, 0, code.length);
			out.putShort(handlerCount);
			if (handlerCount > 0) {
				Handler h = firstHandler;
				while (h != null) {
					out.putShort(h.start.position).putShort(h.end.position)
					.putShort(h.handler.position).putShort(h.type);
					h = h.next;
				}
			}
			attributeCount = 0;
			if (localVar != null) {
				++attributeCount;
			}
			if (localVarType != null) {
				++attributeCount;
			}
			if (lineNumber != null) {
				++attributeCount;
			}
			if (stackMap != null) {
				++attributeCount;
			}
			if (cattrs != null) {
				attributeCount += cattrs.getCount();
			}
			out.putShort(attributeCount);
			if (localVar != null) {
				out.putShort(cw.newUTF8("LocalVariableTable"));
				out.putInt(localVar.length + 2).putShort(localVarCount);
				out.putByteArray(localVar.data, 0, localVar.length);
			}
			if (localVarType != null) {
				out.putShort(cw.newUTF8("LocalVariableTypeTable"));
				out.putInt(localVarType.length + 2).putShort(localVarTypeCount);
				out.putByteArray(localVarType.data, 0, localVarType.length);
			}
			if (lineNumber != null) {
				out.putShort(cw.newUTF8("LineNumberTable"));
				out.putInt(lineNumber.length + 2).putShort(lineNumberCount);
				out.putByteArray(lineNumber.data, 0, lineNumber.length);
			}
			if (stackMap != null) {
				final boolean zip = (cw.version & 0xFFFF) >= Opcodes.V1_6;
				out.putShort(cw.newUTF8(zip ? "StackMapTable" : "StackMap"));
				out.putInt(stackMap.length + 2).putShort(frameCount);
				out.putByteArray(stackMap.data, 0, stackMap.length);
			}
			if (cattrs != null) {
				cattrs.put(cw, code.data, code.length, maxLocals, maxStack, out);
			}
		}
		if (exceptionCount > 0) {
			out.putShort(cw.newUTF8("Exceptions")).putInt(
					2 * exceptionCount + 2);
			out.putShort(exceptionCount);
			for (int i = 0; i < exceptionCount; ++i) {
				out.putShort(exceptions[i]);
			}
		}
		if ((access & Opcodes.ACC_SYNTHETIC) != 0
				&& ((cw.version & 0xFFFF) < Opcodes.V1_5 || (access & ClassWriter.ACC_SYNTHETIC_ATTRIBUTE) != 0)) {
			out.putShort(cw.newUTF8("Synthetic")).putInt(0);
		}
		if ((access & Opcodes.ACC_DEPRECATED) != 0) {
			out.putShort(cw.newUTF8("Deprecated")).putInt(0);
		}
		if (ClassReader.SIGNATURES && signature != null) {
			out.putShort(cw.newUTF8("Signature")).putInt(2)
			.putShort(cw.newUTF8(signature));
		}
		if (ClassReader.ANNOTATIONS && annd != null) {
			out.putShort(cw.newUTF8("AnnotationDefault"));
			out.putInt(annd.length);
			out.putByteArray(annd.data, 0, annd.length);
		}
		if (ClassReader.ANNOTATIONS && anns != null) {
			out.putShort(cw.newUTF8("RuntimeVisibleAnnotations"));
			anns.put(out);
		}
		if (ClassReader.ANNOTATIONS && ianns != null) {
			out.putShort(cw.newUTF8("RuntimeInvisibleAnnotations"));
			ianns.put(out);
		}
		if (ClassReader.ANNOTATIONS && panns != null) {
			out.putShort(cw.newUTF8("RuntimeVisibleParameterAnnotations"));
			AnnotationWriter.put(panns, synthetics, out);
		}
		if (ClassReader.ANNOTATIONS && ipanns != null) {
			out.putShort(cw.newUTF8("RuntimeInvisibleParameterAnnotations"));
			AnnotationWriter.put(ipanns, synthetics, out);
		}
		if (attrs != null) {
			attrs.put(cw, null, 0, -1, -1, out);
		}
	}

	/**
	 * Resizes and replaces the temporary instructions inserted by
	 * {@link Label#resolve} for wide forward jumps, while keeping jump offsets
	 * and instruction addresses consistent. This may require to resize other
	 * existing instructions, or even to introduce new instructions: for
	 * example, increasing the size of an instruction by 2 at the middle of a
	 * method can increases the offset of an IFEQ instruction from 32766 to
	 * 32768, in which case IFEQ 32766 must be replaced with IFNEQ 8 GOTO_W
	 * 32765. This, in turn, may require to increase the size of another jump
	 * instruction, and so on... All these operations are handled automatically
	 * by this method.
	 * <p>
	 * <i>This method must be called after all the method that is being built
	 * has been visited</i>. In particular, the {@link Label Label} objects used
	 * to construct the method are no longer valid after this method has been
	 * called.
	 */
	private void resizeInstructions() {
		byte[] b = code.data; // bytecode of the method
		int u, v, label; // indexes in b
		int i, j; // loop indexes
		/*
		 * 1st step: As explained above, resizing an instruction may require to
		 * resize another one, which may require to resize yet another one, and
		 * so on. The first step of the algorithm consists in finding all the
		 * instructions that need to be resized, without modifying the code.
		 * This is done by the following "fix point" algorithm:
		 * 
		 * Parse the code to find the jump instructions whose offset will need
		 * more than 2 bytes to be stored (the future offset is computed from
		 * the current offset and from the number of bytes that will be inserted
		 * or removed between the source and target instructions). For each such
		 * instruction, adds an entry in (a copy of) the indexes and sizes
		 * arrays (if this has not already been done in a previous iteration!).
		 * 
		 * If at least one entry has been added during the previous step, go
		 * back to the beginning, otherwise stop.
		 * 
		 * In fact the real algorithm is complicated by the fact that the size
		 * of TABLESWITCH and LOOKUPSWITCH instructions depends on their
		 * position in the bytecode (because of padding). In order to ensure the
		 * convergence of the algorithm, the number of bytes to be added or
		 * removed from these instructions is over estimated during the previous
		 * loop, and computed exactly only after the loop is finished (this
		 * requires another pass to parse the bytecode of the method).
		 */
		int[] allIndexes = new int[0]; // copy of indexes
		int[] allSizes = new int[0]; // copy of sizes
		boolean[] resize; // instructions to be resized
		int newOffset; // future offset of a jump instruction

		resize = new boolean[code.length];

		// 3 = loop again, 2 = loop ended, 1 = last pass, 0 = done
		int state = 3;
		do {
			if (state == 3) {
				state = 2;
			}
			u = 0;
			while (u < b.length) {
				int opcode = b[u] & 0xFF; // opcode of current instruction
				int insert = 0; // bytes to be added after this instruction

				switch (ClassWriter.TYPE[opcode]) {
				case ClassWriter.NOARG_INSN:
				case ClassWriter.IMPLVAR_INSN:
					u += 1;
					break;
				case ClassWriter.LABEL_INSN:
					if (opcode > 201) {
						// converts temporary opcodes 202 to 217, 218 and
						// 219 to IFEQ ... JSR (inclusive), IFNULL and
						// IFNONNULL
						opcode = opcode < 218 ? opcode - 49 : opcode - 20;
						label = u + readUnsignedShort(b, u + 1);
					} else {
						label = u + readShort(b, u + 1);
					}
					newOffset = getNewOffset(allIndexes, allSizes, u, label);
					if (newOffset < Short.MIN_VALUE
							|| newOffset > Short.MAX_VALUE) {
						if (!resize[u]) {
							if (opcode == Opcodes.GOTO || opcode == Opcodes.JSR) {
								// two additional bytes will be required to
								// replace this GOTO or JSR instruction with
								// a GOTO_W or a JSR_W
								insert = 2;
							} else {
								// five additional bytes will be required to
								// replace this IFxxx <l> instruction with
								// IFNOTxxx <l'> GOTO_W <l>, where IFNOTxxx
								// is the "opposite" opcode of IFxxx (i.e.,
								// IFNE for IFEQ) and where <l'> designates
								// the instruction just after the GOTO_W.
								insert = 5;
							}
							resize[u] = true;
						}
					}
					u += 3;
					break;
				case ClassWriter.LABELW_INSN:
					u += 5;
					break;
				case ClassWriter.TABL_INSN:
					if (state == 1) {
						// true number of bytes to be added (or removed)
						// from this instruction = (future number of padding
						// bytes - current number of padding byte) -
						// previously over estimated variation =
						// = ((3 - newOffset%4) - (3 - u%4)) - u%4
						// = (-newOffset%4 + u%4) - u%4
						// = -(newOffset & 3)
						newOffset = getNewOffset(allIndexes, allSizes, 0, u);
						insert = -(newOffset & 3);
					} else if (!resize[u]) {
						// over estimation of the number of bytes to be
						// added to this instruction = 3 - current number
						// of padding bytes = 3 - (3 - u%4) = u%4 = u & 3
						insert = u & 3;
						resize[u] = true;
					}
					// skips instruction
					u = u + 4 - (u & 3);
					u += 4 * (readInt(b, u + 8) - readInt(b, u + 4) + 1) + 12;
					break;
				case ClassWriter.LOOK_INSN:
					if (state == 1) {
						// like TABL_INSN
						newOffset = getNewOffset(allIndexes, allSizes, 0, u);
						insert = -(newOffset & 3);
					} else if (!resize[u]) {
						// like TABL_INSN
						insert = u & 3;
						resize[u] = true;
					}
					// skips instruction
					u = u + 4 - (u & 3);
					u += 8 * readInt(b, u + 4) + 8;
					break;
				case ClassWriter.WIDE_INSN:
					opcode = b[u + 1] & 0xFF;
					if (opcode == Opcodes.IINC) {
						u += 6;
					} else {
						u += 4;
					}
					break;
				case ClassWriter.VAR_INSN:
				case ClassWriter.SBYTE_INSN:
				case ClassWriter.LDC_INSN:
					u += 2;
					break;
				case ClassWriter.SHORT_INSN:
				case ClassWriter.LDCW_INSN:
				case ClassWriter.FIELDORMETH_INSN:
				case ClassWriter.TYPE_INSN:
				case ClassWriter.IINC_INSN:
					u += 3;
					break;
				case ClassWriter.ITFDYNMETH_INSN:
					u += 5;
					break;
					// case ClassWriter.MANA_INSN:
				default:
					u += 4;
					break;
				}
				if (insert != 0) {
					// adds a new (u, insert) entry in the allIndexes and
					// allSizes arrays
					final int[] newIndexes = new int[allIndexes.length + 1];
					final int[] newSizes = new int[allSizes.length + 1];
					System.arraycopy(allIndexes, 0, newIndexes, 0,
							allIndexes.length);
					System.arraycopy(allSizes, 0, newSizes, 0, allSizes.length);
					newIndexes[allIndexes.length] = u;
					newSizes[allSizes.length] = insert;
					allIndexes = newIndexes;
					allSizes = newSizes;
					if (insert > 0) {
						state = 3;
					}
				}
			}
			if (state < 3) {
				--state;
			}
		} while (state != 0);

		// 2nd step:
		// copies the bytecode of the method into a new bytevector, updates the
		// offsets, and inserts (or removes) bytes as requested.

		final ByteVector newCode = new ByteVector(code.length);

		u = 0;
		while (u < code.length) {
			int opcode = b[u] & 0xFF;
			switch (ClassWriter.TYPE[opcode]) {
			case ClassWriter.NOARG_INSN:
			case ClassWriter.IMPLVAR_INSN:
				newCode.putByte(opcode);
				u += 1;
				break;
			case ClassWriter.LABEL_INSN:
				if (opcode > 201) {
					// changes temporary opcodes 202 to 217 (inclusive), 218
					// and 219 to IFEQ ... JSR (inclusive), IFNULL and
					// IFNONNULL
					opcode = opcode < 218 ? opcode - 49 : opcode - 20;
					label = u + readUnsignedShort(b, u + 1);
				} else {
					label = u + readShort(b, u + 1);
				}
				newOffset = getNewOffset(allIndexes, allSizes, u, label);
				if (resize[u]) {
					// replaces GOTO with GOTO_W, JSR with JSR_W and IFxxx
					// <l> with IFNOTxxx <l'> GOTO_W <l>, where IFNOTxxx is
					// the "opposite" opcode of IFxxx (i.e., IFNE for IFEQ)
					// and where <l'> designates the instruction just after
					// the GOTO_W.
					if (opcode == Opcodes.GOTO) {
						newCode.putByte(200); // GOTO_W
					} else if (opcode == Opcodes.JSR) {
						newCode.putByte(201); // JSR_W
					} else {
						newCode.putByte(opcode <= 166 ? (opcode + 1 ^ 1) - 1
								: opcode ^ 1);
						newCode.putShort(8); // jump offset
						newCode.putByte(200); // GOTO_W
						// newOffset now computed from start of GOTO_W
						newOffset -= 3;
					}
					newCode.putInt(newOffset);
				} else {
					newCode.putByte(opcode);
					newCode.putShort(newOffset);
				}
				u += 3;
				break;
			case ClassWriter.LABELW_INSN:
				label = u + readInt(b, u + 1);
				newOffset = getNewOffset(allIndexes, allSizes, u, label);
				newCode.putByte(opcode);
				newCode.putInt(newOffset);
				u += 5;
				break;
			case ClassWriter.TABL_INSN:
				// skips 0 to 3 padding bytes
				v = u;
				u = u + 4 - (v & 3);
				// reads and copies instruction
				newCode.putByte(Opcodes.TABLESWITCH);
				newCode.putByteArray(null, 0, (4 - newCode.length % 4) % 4);
				label = v + readInt(b, u);
				u += 4;
				newOffset = getNewOffset(allIndexes, allSizes, v, label);
				newCode.putInt(newOffset);
				j = readInt(b, u);
				u += 4;
				newCode.putInt(j);
				j = readInt(b, u) - j + 1;
				u += 4;
				newCode.putInt(readInt(b, u - 4));
				for (; j > 0; --j) {
					label = v + readInt(b, u);
					u += 4;
					newOffset = getNewOffset(allIndexes, allSizes, v, label);
					newCode.putInt(newOffset);
				}
				break;
			case ClassWriter.LOOK_INSN:
				// skips 0 to 3 padding bytes
				v = u;
				u = u + 4 - (v & 3);
				// reads and copies instruction
				newCode.putByte(Opcodes.LOOKUPSWITCH);
				newCode.putByteArray(null, 0, (4 - newCode.length % 4) % 4);
				label = v + readInt(b, u);
				u += 4;
				newOffset = getNewOffset(allIndexes, allSizes, v, label);
				newCode.putInt(newOffset);
				j = readInt(b, u);
				u += 4;
				newCode.putInt(j);
				for (; j > 0; --j) {
					newCode.putInt(readInt(b, u));
					u += 4;
					label = v + readInt(b, u);
					u += 4;
					newOffset = getNewOffset(allIndexes, allSizes, v, label);
					newCode.putInt(newOffset);
				}
				break;
			case ClassWriter.WIDE_INSN:
				opcode = b[u + 1] & 0xFF;
				if (opcode == Opcodes.IINC) {
					newCode.putByteArray(b, u, 6);
					u += 6;
				} else {
					newCode.putByteArray(b, u, 4);
					u += 4;
				}
				break;
			case ClassWriter.VAR_INSN:
			case ClassWriter.SBYTE_INSN:
			case ClassWriter.LDC_INSN:
				newCode.putByteArray(b, u, 2);
				u += 2;
				break;
			case ClassWriter.SHORT_INSN:
			case ClassWriter.LDCW_INSN:
			case ClassWriter.FIELDORMETH_INSN:
			case ClassWriter.TYPE_INSN:
			case ClassWriter.IINC_INSN:
				newCode.putByteArray(b, u, 3);
				u += 3;
				break;
			case ClassWriter.ITFDYNMETH_INSN:
				newCode.putByteArray(b, u, 5);
				u += 5;
				break;
				// case MANA_INSN:
			default:
				newCode.putByteArray(b, u, 4);
				u += 4;
				break;
			}
		}

		// recomputes the stack map frames
		if (frameCount > 0) {
			if (compute == FRAMES) {
				frameCount = 0;
				stackMap = null;
				previousFrame = null;
				frame = null;
				final Frame f = new Frame();
				f.owner = labels;
				final Type[] args = Type.getArgumentTypes(descriptor);
				f.initInputFrame(cw, access, args, maxLocals);
				visitFrame(f);
				Label l = labels;
				while (l != null) {
					/*
					 * here we need the original label position. getNewOffset
					 * must therefore never have been called for this label.
					 */
					u = l.position - 3;
					if ((l.status & Label.STORE) != 0 || u >= 0 && resize[u]) {
						getNewOffset(allIndexes, allSizes, l);
						// TODO update offsets in UNINITIALIZED values
						visitFrame(l.frame);
					}
					l = l.successor;
				}
			} else {
				/*
				 * Resizing an existing stack map frame table is really hard.
				 * Not only the table must be parsed to update the offets, but
				 * new frames may be needed for jump instructions that were
				 * inserted by this method. And updating the offsets or
				 * inserting frames can change the format of the following
				 * frames, in case of packed frames. In practice the whole table
				 * must be recomputed. For this the frames are marked as
				 * potentially invalid. This will cause the whole class to be
				 * reread and rewritten with the COMPUTE_FRAMES option (see the
				 * ClassWriter.toByteArray method). This is not very efficient
				 * but is much easier and requires much less code than any other
				 * method I can think of.
				 */
				cw.invalidFrames = true;
			}
		}
		// updates the exception handler block labels
		Handler h = firstHandler;
		while (h != null) {
			getNewOffset(allIndexes, allSizes, h.start);
			getNewOffset(allIndexes, allSizes, h.end);
			getNewOffset(allIndexes, allSizes, h.handler);
			h = h.next;
		}
		// updates the instructions addresses in the
		// local var and line number tables
		for (i = 0; i < 2; ++i) {
			final ByteVector bv = i == 0 ? localVar : localVarType;
			if (bv != null) {
				b = bv.data;
				u = 0;
				while (u < bv.length) {
					label = readUnsignedShort(b, u);
					newOffset = getNewOffset(allIndexes, allSizes, 0, label);
					writeShort(b, u, newOffset);
					label += readUnsignedShort(b, u + 2);
					newOffset = getNewOffset(allIndexes, allSizes, 0, label)
					- newOffset;
					writeShort(b, u + 2, newOffset);
					u += 10;
				}
			}
		}
		if (lineNumber != null) {
			b = lineNumber.data;
			u = 0;
			while (u < lineNumber.length) {
				writeShort(
						b,
						u,
						getNewOffset(allIndexes, allSizes, 0,
								readUnsignedShort(b, u)));
				u += 4;
			}
		}
		// updates the labels of the other attributes
		Attribute attr = cattrs;
		while (attr != null) {
			final Label[] labels = attr.getLabels();
			if (labels != null) {
				for (i = labels.length - 1; i >= 0; --i) {
					getNewOffset(allIndexes, allSizes, labels[i]);
				}
			}
			attr = attr.next;
		}

		// replaces old bytecodes with new ones
		code = newCode;
	}

	/**
	 * Starts the visit of a stack map frame.
	 * 
	 * @param offset
	 *            the offset of the instruction to which the frame corresponds.
	 * @param nLocal
	 *            the number of local variables in the frame.
	 * @param nStack
	 *            the number of stack elements in the frame.
	 */
	private void startFrame(final int offset, final int nLocal, final int nStack) {
		final int n = 3 + nLocal + nStack;
		if (frame == null || frame.length < n) {
			frame = new int[n];
		}
		frame[0] = offset;
		frame[1] = nLocal;
		frame[2] = nStack;
		frameIndex = 3;
	}

	@Override
	public AnnotationVisitor visitAnnotation(final String desc,
			final boolean visible) {
		if (!ClassReader.ANNOTATIONS) {
			return null;
		}
		final ByteVector bv = new ByteVector();
		// write type, and reserve space for values count
		bv.putShort(cw.newUTF8(desc)).putShort(0);
		final AnnotationWriter aw = new AnnotationWriter(cw, true, bv, bv, 2);
		if (visible) {
			aw.next = anns;
			anns = aw;
		} else {
			aw.next = ianns;
			ianns = aw;
		}
		return aw;
	}

	@Override
	public AnnotationVisitor visitAnnotationDefault() {
		if (!ClassReader.ANNOTATIONS) {
			return null;
		}
		annd = new ByteVector();
		return new AnnotationWriter(cw, false, annd, null, 0);
	}

	@Override
	public void visitAttribute(final Attribute attr) {
		if (attr.isCodeAttribute()) {
			attr.next = cattrs;
			cattrs = attr;
		} else {
			attr.next = attrs;
			attrs = attr;
		}
	}

	@Override
	public void visitCode() {
	}

	@Override
	public void visitEnd() {
	}

	@Override
	public void visitFieldInsn(final int opcode, final String owner,
			final String name, final String desc) {
		final Item i = cw.newFieldItem(owner, name, desc);
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(opcode, 0, cw, i);
			} else {
				int size;
				// computes the stack size variation
				final char c = desc.charAt(0);
				switch (opcode) {
				case Opcodes.GETSTATIC:
					size = stackSize + (c == 'D' || c == 'J' ? 2 : 1);
					break;
				case Opcodes.PUTSTATIC:
					size = stackSize + (c == 'D' || c == 'J' ? -2 : -1);
					break;
				case Opcodes.GETFIELD:
					size = stackSize + (c == 'D' || c == 'J' ? 1 : 0);
					break;
					// case Constants.PUTFIELD:
				default:
					size = stackSize + (c == 'D' || c == 'J' ? -3 : -2);
					break;
				}
				// updates current and max stack sizes
				if (size > maxStackSize) {
					maxStackSize = size;
				}
				stackSize = size;
			}
		}
		// adds the instruction to the bytecode of the method
		code.put12(opcode, i.index);
	}

	/**
	 * Visits a frame that has been computed from scratch.
	 * 
	 * @param f
	 *            the frame that must be visited.
	 */
	private void visitFrame(final Frame f) {
		int i, t;
		int nTop = 0;
		int nLocal = 0;
		int nStack = 0;
		final int[] locals = f.inputLocals;
		final int[] stacks = f.inputStack;
		// computes the number of locals (ignores TOP types that are just after
		// a LONG or a DOUBLE, and all trailing TOP types)
		for (i = 0; i < locals.length; ++i) {
			t = locals[i];
			if (t == Frame.TOP) {
				++nTop;
			} else {
				nLocal += nTop + 1;
				nTop = 0;
			}
			if (t == Frame.LONG || t == Frame.DOUBLE) {
				++i;
			}
		}
		// computes the stack size (ignores TOP types that are just after
		// a LONG or a DOUBLE)
		for (i = 0; i < stacks.length; ++i) {
			t = stacks[i];
			++nStack;
			if (t == Frame.LONG || t == Frame.DOUBLE) {
				++i;
			}
		}
		// visits the frame and its content
		startFrame(f.owner.position, nLocal, nStack);
		for (i = 0; nLocal > 0; ++i, --nLocal) {
			t = locals[i];
			frame[frameIndex++] = t;
			if (t == Frame.LONG || t == Frame.DOUBLE) {
				++i;
			}
		}
		for (i = 0; i < stacks.length; ++i) {
			t = stacks[i];
			frame[frameIndex++] = t;
			if (t == Frame.LONG || t == Frame.DOUBLE) {
				++i;
			}
		}
		endFrame();
	}

	@Override
	public void visitFrame(final int type, final int nLocal,
			final Object[] local, final int nStack, final Object[] stack) {
		if (!ClassReader.FRAMES || compute == FRAMES) {
			return;
		}

		if (type == Opcodes.F_NEW) {
			startFrame(code.length, nLocal, nStack);
			for (int i = 0; i < nLocal; ++i) {
				if (local[i] instanceof String) {
					frame[frameIndex++] = Frame.OBJECT
					| cw.addType((String) local[i]);
				} else if (local[i] instanceof Integer) {
					frame[frameIndex++] = ((Integer) local[i]).intValue();
				} else {
					frame[frameIndex++] = Frame.UNINITIALIZED
					| cw.addUninitializedType("",
							((Label) local[i]).position);
				}
			}
			for (int i = 0; i < nStack; ++i) {
				if (stack[i] instanceof String) {
					frame[frameIndex++] = Frame.OBJECT
					| cw.addType((String) stack[i]);
				} else if (stack[i] instanceof Integer) {
					frame[frameIndex++] = ((Integer) stack[i]).intValue();
				} else {
					frame[frameIndex++] = Frame.UNINITIALIZED
					| cw.addUninitializedType("",
							((Label) stack[i]).position);
				}
			}
			endFrame();
		} else {
			int delta;
			if (stackMap == null) {
				stackMap = new ByteVector();
				delta = code.length;
			} else {
				delta = code.length - previousFrameOffset - 1;
				if (delta < 0) {
					if (type == Opcodes.F_SAME) {
						return;
					} else {
						throw new IllegalStateException();
					}
				}
			}

			switch (type) {
			case Opcodes.F_FULL:
				stackMap.putByte(FULL_FRAME).putShort(delta).putShort(nLocal);
				for (int i = 0; i < nLocal; ++i) {
					writeFrameType(local[i]);
				}
				stackMap.putShort(nStack);
				for (int i = 0; i < nStack; ++i) {
					writeFrameType(stack[i]);
				}
				break;
			case Opcodes.F_APPEND:
				stackMap.putByte(SAME_FRAME_EXTENDED + nLocal).putShort(delta);
				for (int i = 0; i < nLocal; ++i) {
					writeFrameType(local[i]);
				}
				break;
			case Opcodes.F_CHOP:
				stackMap.putByte(SAME_FRAME_EXTENDED - nLocal).putShort(delta);
				break;
			case Opcodes.F_SAME:
				if (delta < 64) {
					stackMap.putByte(delta);
				} else {
					stackMap.putByte(SAME_FRAME_EXTENDED).putShort(delta);
				}
				break;
			case Opcodes.F_SAME1:
				if (delta < 64) {
					stackMap.putByte(SAME_LOCALS_1_STACK_ITEM_FRAME + delta);
				} else {
					stackMap.putByte(SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED)
					.putShort(delta);
				}
				writeFrameType(stack[0]);
				break;
			}

			previousFrameOffset = code.length;
			++frameCount;
		}
	}

	@Override
	public void visitIincInsn(final int var, final int increment) {
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(Opcodes.IINC, var, null, null);
			}
		}
		if (compute != NOTHING) {
			// updates max locals
			final int n = var + 1;
			if (n > maxLocals) {
				maxLocals = n;
			}
		}
		// adds the instruction to the bytecode of the method
		if (var > 255 || increment > 127 || increment < -128) {
			code.putByte(196 /* WIDE */).put12(Opcodes.IINC, var)
			.putShort(increment);
		} else {
			code.putByte(Opcodes.IINC).put11(var, increment);
		}
	}

	@Override
	public void visitInsn(final int opcode) {
		// adds the instruction to the bytecode of the method
		code.putByte(opcode);
		// update currentBlock
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(opcode, 0, null, null);
			} else {
				// updates current and max stack sizes
				final int size = stackSize + Frame.SIZE[opcode];
				if (size > maxStackSize) {
					maxStackSize = size;
				}
				stackSize = size;
			}
			// if opcode == ATHROW or xRETURN, ends current block (no successor)
			if (opcode >= Opcodes.IRETURN && opcode <= Opcodes.RETURN
					|| opcode == Opcodes.ATHROW) {
				noSuccessor();
			}
		}
	}

	@Override
	public void visitIntInsn(final int opcode, final int operand) {
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(opcode, operand, null, null);
			} else if (opcode != Opcodes.NEWARRAY) {
				// updates current and max stack sizes only for NEWARRAY
				// (stack size variation = 0 for BIPUSH or SIPUSH)
				final int size = stackSize + 1;
				if (size > maxStackSize) {
					maxStackSize = size;
				}
				stackSize = size;
			}
		}
		// adds the instruction to the bytecode of the method
		if (opcode == Opcodes.SIPUSH) {
			code.put12(opcode, operand);
		} else { // BIPUSH or NEWARRAY
			code.put11(opcode, operand);
		}
	}

	@Override
	public void visitJumpInsn(final int opcode, final Label label) {
		Label nextInsn = null;
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(opcode, 0, null, null);
				// 'label' is the target of a jump instruction
				label.getFirst().status |= Label.TARGET;
				// adds 'label' as a successor of this basic block
				addSuccessor(Edge.NORMAL, label);
				if (opcode != Opcodes.GOTO) {
					// creates a Label for the next basic block
					nextInsn = new Label();
				}
			} else {
				if (opcode == Opcodes.JSR) {
					if ((label.status & Label.SUBROUTINE) == 0) {
						label.status |= Label.SUBROUTINE;
						++subroutines;
					}
					currentBlock.status |= Label.JSR;
					addSuccessor(stackSize + 1, label);
					// creates a Label for the next basic block
					nextInsn = new Label();
					/*
					 * note that, by construction in this method, a JSR block
					 * has at least two successors in the control flow graph:
					 * the first one leads the next instruction after the JSR,
					 * while the second one leads to the JSR target.
					 */
				} else {
					// updates current stack size (max stack size unchanged
					// because stack size variation always negative in this
					// case)
					stackSize += Frame.SIZE[opcode];
					addSuccessor(stackSize, label);
				}
			}
		}
		// adds the instruction to the bytecode of the method
		if ((label.status & Label.RESOLVED) != 0
				&& label.position - code.length < Short.MIN_VALUE) {
			/*
			 * case of a backward jump with an offset < -32768. In this case we
			 * automatically replace GOTO with GOTO_W, JSR with JSR_W and IFxxx
			 * <l> with IFNOTxxx <l'> GOTO_W <l>, where IFNOTxxx is the
			 * "opposite" opcode of IFxxx (i.e., IFNE for IFEQ) and where <l'>
			 * designates the instruction just after the GOTO_W.
			 */
			if (opcode == Opcodes.GOTO) {
				code.putByte(200); // GOTO_W
			} else if (opcode == Opcodes.JSR) {
				code.putByte(201); // JSR_W
			} else {
				// if the IF instruction is transformed into IFNOT GOTO_W the
				// next instruction becomes the target of the IFNOT instruction
				if (nextInsn != null) {
					nextInsn.status |= Label.TARGET;
				}
				code.putByte(opcode <= 166 ? (opcode + 1 ^ 1) - 1 : opcode ^ 1);
				code.putShort(8); // jump offset
				code.putByte(200); // GOTO_W
			}
			label.put(this, code, code.length - 1, true);
		} else {
			/*
			 * case of a backward jump with an offset >= -32768, or of a forward
			 * jump with, of course, an unknown offset. In these cases we store
			 * the offset in 2 bytes (which will be increased in
			 * resizeInstructions, if needed).
			 */
			code.putByte(opcode);
			label.put(this, code, code.length - 1, false);
		}
		if (currentBlock != null) {
			if (nextInsn != null) {
				// if the jump instruction is not a GOTO, the next instruction
				// is also a successor of this instruction. Calling visitLabel
				// adds the label of this next instruction as a successor of the
				// current block, and starts a new basic block
				visitLabel(nextInsn);
			}
			if (opcode == Opcodes.GOTO) {
				noSuccessor();
			}
		}
	}

	// ------------------------------------------------------------------------
	// Utility methods: control flow analysis algorithm
	// ------------------------------------------------------------------------

	@Override
	public void visitLabel(final Label label) {
		// resolves previous forward references to label, if any
		resize |= label.resolve(this, code.length, code.data);
		// updates currentBlock
		if ((label.status & Label.DEBUG) != 0) {
			return;
		}
		if (compute == FRAMES) {
			if (currentBlock != null) {
				if (label.position == currentBlock.position) {
					// successive labels, do not start a new basic block
					currentBlock.status |= label.status & Label.TARGET;
					label.frame = currentBlock.frame;
					return;
				}
				// ends current block (with one new successor)
				addSuccessor(Edge.NORMAL, label);
			}
			// begins a new current block
			currentBlock = label;
			if (label.frame == null) {
				label.frame = new Frame();
				label.frame.owner = label;
			}
			// updates the basic block list
			if (previousBlock != null) {
				if (label.position == previousBlock.position) {
					previousBlock.status |= label.status & Label.TARGET;
					label.frame = previousBlock.frame;
					currentBlock = previousBlock;
					return;
				}
				previousBlock.successor = label;
			}
			previousBlock = label;
		} else if (compute == MAXS) {
			if (currentBlock != null) {
				// ends current block (with one new successor)
				currentBlock.outputStackMax = maxStackSize;
				addSuccessor(stackSize, label);
			}
			// begins a new current block
			currentBlock = label;
			// resets the relative current and max stack sizes
			stackSize = 0;
			maxStackSize = 0;
			// updates the basic block list
			if (previousBlock != null) {
				previousBlock.successor = label;
			}
			previousBlock = label;
		}
	}

	@Override
	public void visitLdcInsn(final Object cst) {
		final Item i = cw.newConstItem(cst);
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(Opcodes.LDC, 0, cw, i);
			} else {
				int size;
				// computes the stack size variation
				if (i.type == ClassWriter.LONG || i.type == ClassWriter.DOUBLE) {
					size = stackSize + 2;
				} else {
					size = stackSize + 1;
				}
				// updates current and max stack sizes
				if (size > maxStackSize) {
					maxStackSize = size;
				}
				stackSize = size;
			}
		}
		// adds the instruction to the bytecode of the method
		final int index = i.index;
		if (i.type == ClassWriter.LONG || i.type == ClassWriter.DOUBLE) {
			code.put12(20 /* LDC2_W */, index);
		} else if (index >= 256) {
			code.put12(19 /* LDC_W */, index);
		} else {
			code.put11(Opcodes.LDC, index);
		}
	}

	// ------------------------------------------------------------------------
	// Utility methods: stack map frames
	// ------------------------------------------------------------------------

	@Override
	public void visitLineNumber(final int line, final Label start) {
		if (lineNumber == null) {
			lineNumber = new ByteVector();
		}
		++lineNumberCount;
		lineNumber.putShort(start.position);
		lineNumber.putShort(line);
	}

	@Override
	public void visitLocalVariable(final String name, final String desc,
			final String signature, final Label start, final Label end,
			final int index) {
		if (signature != null) {
			if (localVarType == null) {
				localVarType = new ByteVector();
			}
			++localVarTypeCount;
			localVarType.putShort(start.position)
			.putShort(end.position - start.position)
			.putShort(cw.newUTF8(name)).putShort(cw.newUTF8(signature))
			.putShort(index);
		}
		if (localVar == null) {
			localVar = new ByteVector();
		}
		++localVarCount;
		localVar.putShort(start.position)
		.putShort(end.position - start.position)
		.putShort(cw.newUTF8(name)).putShort(cw.newUTF8(desc))
		.putShort(index);
		if (compute != NOTHING) {
			// updates max locals
			final char c = desc.charAt(0);
			final int n = index + (c == 'J' || c == 'D' ? 2 : 1);
			if (n > maxLocals) {
				maxLocals = n;
			}
		}
	}

	@Override
	public void visitLookupSwitchInsn(final Label dflt, final int[] keys,
			final Label[] labels) {
		// adds the instruction to the bytecode of the method
		final int source = code.length;
		code.putByte(Opcodes.LOOKUPSWITCH);
		code.putByteArray(null, 0, (4 - code.length % 4) % 4);
		dflt.put(this, code, source, true);
		code.putInt(labels.length);
		for (int i = 0; i < labels.length; ++i) {
			code.putInt(keys[i]);
			labels[i].put(this, code, source, true);
		}
		// updates currentBlock
		visitSwitchInsn(dflt, labels);
	}

	@Override
	public void visitMaxs(final int maxStack, final int maxLocals) {
		if (ClassReader.FRAMES && compute == FRAMES) {
			// completes the control flow graph with exception handler blocks
			Handler handler = firstHandler;
			while (handler != null) {
				Label l = handler.start.getFirst();
				final Label h = handler.handler.getFirst();
				final Label e = handler.end.getFirst();
				// computes the kind of the edges to 'h'
				final String t = handler.desc == null ? "java/lang/Throwable"
						: handler.desc;
				final int kind = Frame.OBJECT | cw.addType(t);
				// h is an exception handler
				h.status |= Label.TARGET;
				// adds 'h' as a successor of labels between 'start' and 'end'
				while (l != e) {
					// creates an edge to 'h'
					final Edge b = new Edge();
					b.info = kind;
					b.successor = h;
					// adds it to the successors of 'l'
					b.next = l.successors;
					l.successors = b;
					// goes to the next label
					l = l.successor;
				}
				handler = handler.next;
			}

			// creates and visits the first (implicit) frame
			Frame f = labels.frame;
			final Type[] args = Type.getArgumentTypes(descriptor);
			f.initInputFrame(cw, access, args, this.maxLocals);
			visitFrame(f);

			/*
			 * fix point algorithm: mark the first basic block as 'changed'
			 * (i.e. put it in the 'changed' list) and, while there are changed
			 * basic blocks, choose one, mark it as unchanged, and update its
			 * successors (which can be changed in the process).
			 */
			int max = 0;
			Label changed = labels;
			while (changed != null) {
				// removes a basic block from the list of changed basic blocks
				final Label l = changed;
				changed = changed.next;
				l.next = null;
				f = l.frame;
				// a reachable jump target must be stored in the stack map
				if ((l.status & Label.TARGET) != 0) {
					l.status |= Label.STORE;
				}
				// all visited labels are reachable, by definition
				l.status |= Label.REACHABLE;
				// updates the (absolute) maximum stack size
				final int blockMax = f.inputStack.length + l.outputStackMax;
				if (blockMax > max) {
					max = blockMax;
				}
				// updates the successors of the current basic block
				Edge e = l.successors;
				while (e != null) {
					final Label n = e.successor.getFirst();
					final boolean change = f.merge(cw, n.frame, e.info);
					if (change && n.next == null) {
						// if n has changed and is not already in the 'changed'
						// list, adds it to this list
						n.next = changed;
						changed = n;
					}
					e = e.next;
				}
			}

			// visits all the frames that must be stored in the stack map
			Label l = labels;
			while (l != null) {
				f = l.frame;
				if ((l.status & Label.STORE) != 0) {
					visitFrame(f);
				}
				if ((l.status & Label.REACHABLE) == 0) {
					// finds start and end of dead basic block
					final Label k = l.successor;
					final int start = l.position;
					final int end = (k == null ? code.length : k.position) - 1;
					// if non empty basic block
					if (end >= start) {
						max = Math.max(max, 1);
						// replaces instructions with NOP ... NOP ATHROW
						for (int i = start; i < end; ++i) {
							code.data[i] = Opcodes.NOP;
						}
						code.data[end] = (byte) Opcodes.ATHROW;
						// emits a frame for this unreachable block
						startFrame(start, 0, 1);
						frame[frameIndex++] = Frame.OBJECT
						| cw.addType("java/lang/Throwable");
						endFrame();
					}
				}
				l = l.successor;
			}

			this.maxStack = max;
		} else if (compute == MAXS) {
			// completes the control flow graph with exception handler blocks
			Handler handler = firstHandler;
			while (handler != null) {
				Label l = handler.start;
				final Label h = handler.handler;
				final Label e = handler.end;
				// adds 'h' as a successor of labels between 'start' and 'end'
				while (l != e) {
					// creates an edge to 'h'
					final Edge b = new Edge();
					b.info = Edge.EXCEPTION;
					b.successor = h;
					// adds it to the successors of 'l'
					if ((l.status & Label.JSR) == 0) {
						b.next = l.successors;
						l.successors = b;
					} else {
						// if l is a JSR block, adds b after the first two edges
						// to preserve the hypothesis about JSR block successors
						// order (see {@link #visitJumpInsn})
						b.next = l.successors.next.next;
						l.successors.next.next = b;
					}
					// goes to the next label
					l = l.successor;
				}
				handler = handler.next;
			}

			if (subroutines > 0) {
				// completes the control flow graph with the RET successors
				/*
				 * first step: finds the subroutines. This step determines, for
				 * each basic block, to which subroutine(s) it belongs.
				 */
				// finds the basic blocks that belong to the "main" subroutine
				int id = 0;
				labels.visitSubroutine(null, 1, subroutines);
				// finds the basic blocks that belong to the real subroutines
				Label l = labels;
				while (l != null) {
					if ((l.status & Label.JSR) != 0) {
						// the subroutine is defined by l's TARGET, not by l
						final Label subroutine = l.successors.next.successor;
						// if this subroutine has not been visited yet...
						if ((subroutine.status & Label.VISITED) == 0) {
							// ...assigns it a new id and finds its basic blocks
							id += 1;
							subroutine.visitSubroutine(null, id / 32L << 32
									| 1L << id % 32, subroutines);
						}
					}
					l = l.successor;
				}
				// second step: finds the successors of RET blocks
				l = labels;
				while (l != null) {
					if ((l.status & Label.JSR) != 0) {
						Label L = labels;
						while (L != null) {
							L.status &= ~Label.VISITED2;
							L = L.successor;
						}
						// the subroutine is defined by l's TARGET, not by l
						final Label subroutine = l.successors.next.successor;
						subroutine.visitSubroutine(l, 0, subroutines);
					}
					l = l.successor;
				}
			}

			/*
			 * control flow analysis algorithm: while the block stack is not
			 * empty, pop a block from this stack, update the max stack size,
			 * compute the true (non relative) begin stack size of the
			 * successors of this block, and push these successors onto the
			 * stack (unless they have already been pushed onto the stack).
			 * Note: by hypothesis, the {@link Label#inputStackTop} of the
			 * blocks in the block stack are the true (non relative) beginning
			 * stack sizes of these blocks.
			 */
			int max = 0;
			Label stack = labels;
			while (stack != null) {
				// pops a block from the stack
				Label l = stack;
				stack = stack.next;
				// computes the true (non relative) max stack size of this block
				final int start = l.inputStackTop;
				final int blockMax = start + l.outputStackMax;
				// updates the global max stack size
				if (blockMax > max) {
					max = blockMax;
				}
				// analyzes the successors of the block
				Edge b = l.successors;
				if ((l.status & Label.JSR) != 0) {
					// ignores the first edge of JSR blocks (virtual successor)
					b = b.next;
				}
				while (b != null) {
					l = b.successor;
					// if this successor has not already been pushed...
					if ((l.status & Label.PUSHED) == 0) {
						// computes its true beginning stack size...
						l.inputStackTop = b.info == Edge.EXCEPTION ? 1 : start
								+ b.info;
						// ...and pushes it onto the stack
						l.status |= Label.PUSHED;
						l.next = stack;
						stack = l;
					}
					b = b.next;
				}
			}
			this.maxStack = max;
		} else {
			this.maxStack = maxStack;
			this.maxLocals = maxLocals;
		}
	}

	@Override
	public void visitMethodInsn(final int opcode, final String owner,
			final String name, final String desc) {
		final boolean itf = opcode == Opcodes.INVOKEINTERFACE;
		final Item i = opcode == Opcodes.INVOKEDYNAMIC ? cw.newNameTypeItem(
				name, desc) : cw.newMethodItem(owner, name, desc, itf);
				int argSize = i.intVal;
				// Label currentBlock = this.currentBlock;
				if (currentBlock != null) {
					if (compute == FRAMES) {
						currentBlock.frame.execute(opcode, 0, cw, i);
					} else {
						/*
						 * computes the stack size variation. In order not to recompute
						 * several times this variation for the same Item, we use the
						 * intVal field of this item to store this variation, once it
						 * has been computed. More precisely this intVal field stores
						 * the sizes of the arguments and of the return value
						 * corresponding to desc.
						 */
						if (argSize == 0) {
							// the above sizes have not been computed yet,
							// so we compute them...
							argSize = Type.getArgumentsAndReturnSizes(desc);
							// ... and we save them in order
							// not to recompute them in the future
							i.intVal = argSize;
						}
						int size;
						if (opcode == Opcodes.INVOKESTATIC
								|| opcode == Opcodes.INVOKEDYNAMIC) {
							size = stackSize - (argSize >> 2) + (argSize & 0x03) + 1;
						} else {
							size = stackSize - (argSize >> 2) + (argSize & 0x03);
						}
						// updates current and max stack sizes
						if (size > maxStackSize) {
							maxStackSize = size;
						}
						stackSize = size;
					}
				}
				// adds the instruction to the bytecode of the method
				if (itf) {
					if (argSize == 0) {
						argSize = Type.getArgumentsAndReturnSizes(desc);
						i.intVal = argSize;
					}
					code.put12(Opcodes.INVOKEINTERFACE, i.index).put11(argSize >> 2, 0);
				} else {
					code.put12(opcode, i.index);
					if (opcode == Opcodes.INVOKEDYNAMIC) {
						code.putShort(0);
					}
				}
	}

	@Override
	public void visitMultiANewArrayInsn(final String desc, final int dims) {
		final Item i = cw.newClassItem(desc);
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(Opcodes.MULTIANEWARRAY, dims, cw, i);
			} else {
				// updates current stack size (max stack size unchanged because
				// stack size variation always negative or null)
				stackSize += 1 - dims;
			}
		}
		// adds the instruction to the bytecode of the method
		code.put12(Opcodes.MULTIANEWARRAY, i.index).putByte(dims);
	}

	// ------------------------------------------------------------------------
	// Utility methods: dump bytecode array
	// ------------------------------------------------------------------------

	@Override
	public AnnotationVisitor visitParameterAnnotation(final int parameter,
			final String desc, final boolean visible) {
		if (!ClassReader.ANNOTATIONS) {
			return null;
		}
		final ByteVector bv = new ByteVector();
		if ("Ljava/lang/Synthetic;".equals(desc)) {
			// workaround for a bug in javac with synthetic parameters
			// see ClassReader.readParameterAnnotations
			synthetics = Math.max(synthetics, parameter + 1);
			return new AnnotationWriter(cw, false, bv, null, 0);
		}
		// write type, and reserve space for values count
		bv.putShort(cw.newUTF8(desc)).putShort(0);
		final AnnotationWriter aw = new AnnotationWriter(cw, true, bv, bv, 2);
		if (visible) {
			if (panns == null) {
				panns = new AnnotationWriter[Type.getArgumentTypes(descriptor).length];
			}
			aw.next = panns[parameter];
			panns[parameter] = aw;
		} else {
			if (ipanns == null) {
				ipanns = new AnnotationWriter[Type.getArgumentTypes(descriptor).length];
			}
			aw.next = ipanns[parameter];
			ipanns[parameter] = aw;
		}
		return aw;
	}

	private void visitSwitchInsn(final Label dflt, final Label[] labels) {
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(Opcodes.LOOKUPSWITCH, 0, null, null);
				// adds current block successors
				addSuccessor(Edge.NORMAL, dflt);
				dflt.getFirst().status |= Label.TARGET;
				for (int i = 0; i < labels.length; ++i) {
					addSuccessor(Edge.NORMAL, labels[i]);
					labels[i].getFirst().status |= Label.TARGET;
				}
			} else {
				// updates current stack size (max stack size unchanged)
				--stackSize;
				// adds current block successors
				addSuccessor(stackSize, dflt);
				for (int i = 0; i < labels.length; ++i) {
					addSuccessor(stackSize, labels[i]);
				}
			}
			// ends current block
			noSuccessor();
		}
	}

	// ------------------------------------------------------------------------
	// Utility methods: instruction resizing (used to handle GOTO_W and JSR_W)
	// ------------------------------------------------------------------------

	@Override
	public void visitTableSwitchInsn(final int min, final int max,
			final Label dflt, final Label[] labels) {
		// adds the instruction to the bytecode of the method
		final int source = code.length;
		code.putByte(Opcodes.TABLESWITCH);
		code.putByteArray(null, 0, (4 - code.length % 4) % 4);
		dflt.put(this, code, source, true);
		code.putInt(min).putInt(max);
		for (int i = 0; i < labels.length; ++i) {
			labels[i].put(this, code, source, true);
		}
		// updates currentBlock
		visitSwitchInsn(dflt, labels);
	}

	@Override
	public void visitTryCatchBlock(final Label start, final Label end,
			final Label handler, final String type) {
		++handlerCount;
		final Handler h = new Handler();
		h.start = start;
		h.end = end;
		h.handler = handler;
		h.desc = type;
		h.type = type != null ? cw.newClass(type) : 0;
		if (lastHandler == null) {
			firstHandler = h;
		} else {
			lastHandler.next = h;
		}
		lastHandler = h;
	}

	@Override
	public void visitTypeInsn(final int opcode, final String type) {
		final Item i = cw.newClassItem(type);
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(opcode, code.length, cw, i);
			} else if (opcode == Opcodes.NEW) {
				// updates current and max stack sizes only if opcode == NEW
				// (no stack change for ANEWARRAY, CHECKCAST, INSTANCEOF)
				final int size = stackSize + 1;
				if (size > maxStackSize) {
					maxStackSize = size;
				}
				stackSize = size;
			}
		}
		// adds the instruction to the bytecode of the method
		code.put12(opcode, i.index);
	}

	@Override
	public void visitVarInsn(final int opcode, final int var) {
		// Label currentBlock = this.currentBlock;
		if (currentBlock != null) {
			if (compute == FRAMES) {
				currentBlock.frame.execute(opcode, var, null, null);
			} else {
				// updates current and max stack sizes
				if (opcode == Opcodes.RET) {
					// no stack change, but end of current block (no successor)
					currentBlock.status |= Label.RET;
					// save 'stackSize' here for future use
					// (see {@link #findSubroutineSuccessors})
					currentBlock.inputStackTop = stackSize;
					noSuccessor();
				} else { // xLOAD or xSTORE
					final int size = stackSize + Frame.SIZE[opcode];
					if (size > maxStackSize) {
						maxStackSize = size;
					}
					stackSize = size;
				}
			}
		}
		if (compute != NOTHING) {
			// updates max locals
			int n;
			if (opcode == Opcodes.LLOAD || opcode == Opcodes.DLOAD
					|| opcode == Opcodes.LSTORE || opcode == Opcodes.DSTORE) {
				n = var + 2;
			} else {
				n = var + 1;
			}
			if (n > maxLocals) {
				maxLocals = n;
			}
		}
		// adds the instruction to the bytecode of the method
		if (var < 4 && opcode != Opcodes.RET) {
			int opt;
			if (opcode < Opcodes.ISTORE) {
				/* ILOAD_0 */
				opt = 26 + (opcode - Opcodes.ILOAD << 2) + var;
			} else {
				/* ISTORE_0 */
				opt = 59 + (opcode - Opcodes.ISTORE << 2) + var;
			}
			code.putByte(opt);
		} else if (var >= 256) {
			code.putByte(196 /* WIDE */).put12(opcode, var);
		} else {
			code.put11(opcode, var);
		}
		if (opcode >= Opcodes.ISTORE && compute == FRAMES && handlerCount > 0) {
			visitLabel(new Label());
		}
	}

	/**
	 * Compress and writes the current frame {@link #frame} in the StackMapTable
	 * attribute.
	 */
	private void writeFrame() {
		final int clocalsSize = frame[1];
		final int cstackSize = frame[2];
		if ((cw.version & 0xFFFF) < Opcodes.V1_6) {
			stackMap.putShort(frame[0]).putShort(clocalsSize);
			writeFrameTypes(3, 3 + clocalsSize);
			stackMap.putShort(cstackSize);
			writeFrameTypes(3 + clocalsSize, 3 + clocalsSize + cstackSize);
			return;
		}
		int localsSize = previousFrame[1];
		int type = FULL_FRAME;
		int k = 0;
		int delta;
		if (frameCount == 0) {
			delta = frame[0];
		} else {
			delta = frame[0] - previousFrame[0] - 1;
		}
		if (cstackSize == 0) {
			k = clocalsSize - localsSize;
			switch (k) {
			case -3:
			case -2:
			case -1:
				type = CHOP_FRAME;
				localsSize = clocalsSize;
				break;
			case 0:
				type = delta < 64 ? SAME_FRAME : SAME_FRAME_EXTENDED;
				break;
			case 1:
			case 2:
			case 3:
				type = APPEND_FRAME;
				break;
			}
		} else if (clocalsSize == localsSize && cstackSize == 1) {
			type = delta < 63 ? SAME_LOCALS_1_STACK_ITEM_FRAME
					: SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED;
		}
		if (type != FULL_FRAME) {
			// verify if locals are the same
			int l = 3;
			for (int j = 0; j < localsSize; j++) {
				if (frame[l] != previousFrame[l]) {
					type = FULL_FRAME;
					break;
				}
				l++;
			}
		}
		switch (type) {
		case SAME_FRAME:
			stackMap.putByte(delta);
			break;
		case SAME_LOCALS_1_STACK_ITEM_FRAME:
			stackMap.putByte(SAME_LOCALS_1_STACK_ITEM_FRAME + delta);
			writeFrameTypes(3 + clocalsSize, 4 + clocalsSize);
			break;
		case SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED:
			stackMap.putByte(SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED).putShort(
					delta);
			writeFrameTypes(3 + clocalsSize, 4 + clocalsSize);
			break;
		case SAME_FRAME_EXTENDED:
			stackMap.putByte(SAME_FRAME_EXTENDED).putShort(delta);
			break;
		case CHOP_FRAME:
			stackMap.putByte(SAME_FRAME_EXTENDED + k).putShort(delta);
			break;
		case APPEND_FRAME:
			stackMap.putByte(SAME_FRAME_EXTENDED + k).putShort(delta);
			writeFrameTypes(3 + localsSize, 3 + clocalsSize);
			break;
			// case FULL_FRAME:
		default:
			stackMap.putByte(FULL_FRAME).putShort(delta).putShort(clocalsSize);
			writeFrameTypes(3, 3 + clocalsSize);
			stackMap.putShort(cstackSize);
			writeFrameTypes(3 + clocalsSize, 3 + clocalsSize + cstackSize);
		}
	}

	private void writeFrameType(final Object type) {
		if (type instanceof String) {
			stackMap.putByte(7).putShort(cw.newClass((String) type));
		} else if (type instanceof Integer) {
			stackMap.putByte(((Integer) type).intValue());
		} else {
			stackMap.putByte(8).putShort(((Label) type).position);
		}
	}

	/**
	 * Writes some types of the current frame {@link #frame} into the
	 * StackMapTableAttribute. This method converts types from the format used
	 * in {@link Label} to the format used in StackMapTable attributes. In
	 * particular, it converts type table indexes to constant pool indexes.
	 * 
	 * @param start
	 *            index of the first type in {@link #frame} to write.
	 * @param end
	 *            index of last type in {@link #frame} to write (exclusive).
	 */
	private void writeFrameTypes(final int start, final int end) {
		for (int i = start; i < end; ++i) {
			final int t = frame[i];
			int d = t & Frame.DIM;
			if (d == 0) {
				final int v = t & Frame.BASE_VALUE;
				switch (t & Frame.BASE_KIND) {
				case Frame.OBJECT:
					stackMap.putByte(7).putShort(
							cw.newClass(cw.typeTable[v].strVal1));
					break;
				case Frame.UNINITIALIZED:
					stackMap.putByte(8).putShort(cw.typeTable[v].intVal);
					break;
				default:
					stackMap.putByte(v);
				}
			} else {
				final StringBuffer buf = new StringBuffer();
				d >>= 28;
		while (d-- > 0) {
			buf.append('[');
		}
		if ((t & Frame.BASE_KIND) == Frame.OBJECT) {
			buf.append('L');
			buf.append(cw.typeTable[t & Frame.BASE_VALUE].strVal1);
			buf.append(';');
		} else {
			switch (t & 0xF) {
			case 1:
				buf.append('I');
				break;
			case 2:
				buf.append('F');
				break;
			case 3:
				buf.append('D');
				break;
			case 9:
				buf.append('Z');
				break;
			case 10:
				buf.append('B');
				break;
			case 11:
				buf.append('C');
				break;
			case 12:
				buf.append('S');
				break;
			default:
				buf.append('J');
			}
		}
		stackMap.putByte(7).putShort(cw.newClass(buf.toString()));
			}
		}
	}
}
